10．用简便算法计算下面各题．
| 98×101 | 48×125 | 342-53-47 |
| 0.6+7.91+3.4+0.09 | 99×34+34 | 17×25-25×7 |
8．看谁算得又对又快．
0 164537 164545 164551 164555 164561 164563 164567 164573 164575 164581 164587 164591 164593 164597 164603 164605 164611 164615 164617 164621 164623 164627 164629 164631 164632 164633 164635 164636 164637 164639 164641 164645 164647 164651 164653 164657 164663 164665 164671 164675 164677 164681 164687 164693 164695 164701 164705 164707 164713 164717 164723 164731 199269
| 84÷21= | 300-50÷5= | 860-10×50= | 45÷（3×5）= |
| 0÷35= | 200÷5÷4= | 35-5×6= | 58×0+987= |
| 0.72-0.28= | 125×8= | 3.8+2.2= | 8.6-2.48= |
| 81.6÷10= | 100×3.5= | 2.03×10= | 15-7.8= |
| 47+103= | 2000÷25×4= | 96-（16+24）= | 300-64÷8= |